The Apostasy and Restoration are basic principles of the restored gospel of Jesus Christ and truly all of Christianity. As we can see below, this wasn't or shouldn't have been a surprise and was prophesied in both the Old and New Testaments.
"Behold, the days come, saith the Lord God, that I will send a famine in the land, not a famine of bread, nor a thirst for water, but of hearing the words of the Lord: And they shall wander from sea to sea, and from the north even to the east, they shall run to and fro to seek the word of the Lord, and shall not find it." Amos 8:11-12
"And he shall send Jesus Christ, which before was preached unto you: Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began." Acts 3:20-21
"Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and by our gathering together unto him, That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand. Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;" 2 Thessalonians 2:1-3
When Jesus was on the earth, He formed His church with a certain order. When that order was gone, the Apostasy occurred.
"And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone;" Ephesians 2:20
When we came to Earth, we forget who and what we are. As the poet so eloquently put it...
Our birth is but a sleep and a forgetting:
The Soul that rises with us, our life's Star,
Hath had elsewhere its setting,
And cometh from afar:
Not in entire forgetfulness,
And not in utter nakedness,
But trailing clouds of glory do we come
From God, who is our home:...
It is the quest of life to gain and embrace a remembering...
"And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent." John 17:3
I thank my Heavenly Father and Jesus Christ for my knowledge of the Restoration and allowing me to be part of the "magnificent wave of truth and righteousness."